swap out nixops4 from implementation

deployment/data-model-test.nix

@@ -126,34 +126,11 @@ in
                 {
                   _class = "fediversity-environment";
                   resources.shell.login-shell.username = "operator";
-                  implementation =
-                    _requests:
-                    { providers, ... }:
-                    {
-                      _class = "nixops4Deployment";
-                      providers = {
-                        inherit (inputs.nixops4.modules.nixops4Provider) local;
-                      };
-                      # this seems checked according to {providers,resources,resource}.nix,
-                      # values will not eagerly get checked, matching `providers.nix`'s `lazyAttrsOf`,
-                      # whereas allowed keys seem to match those defined in `resource.nix`.
-                      # the content of `resources.the-machine` however, follows `nixops4-nixos`,
-                      # which is not allowed through our `type` yet.
-                      resources.the-machine = {
-                        _class = "nixops4Resource";
-                        type = providers.local.exec;
-                        imports = [
-                          inputs.nixops4-nixos.modules.nixops4Resource.nixos
-                        ];
-                        # nixos.module =
-                        #   { ... }:
-                        #   {
-                        #     _class = "nixos";
-                        #     users.users = config.resources.shell.login-shell.apply (
-                        #       lib.filterAttrs (_name: value: value ? login-shell) requests
-                        #     );
-                        #   };
-                      };
+                  implementation = requests: {
+                    _class = "nixos";
+                    users.users = config.resources.login-shell.policy.apply (
+                      lib.filterAttrs (_name: value: value ? login-shell) requests
+                    );
                   };
                 };
             };
@@ -179,15 +156,20 @@ in
       {
         inherit (fediversity)
           example-configuration
+          example-deployment
           ;
-        has-deployment = lib.isAttrs fediversity.example-deployment.resources.the-machine;
       };
     expected = {
       example-configuration = {
         enable = true;
         applications.hello.enable = true;
       };
-      has-deployment = true;
+      example-deployment = {
+        _class = "nixos";
+        users.users.operator = {
+          isNormalUser = true;
+        };
+      };
     };
   };
 }